1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
|
// SPDX-License-Identifier: GPL-2.0
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
int xdpf_sz;
int sinfo_sz;
int data_len;
int pull_len;
#define XDP_PACKET_HEADROOM 256
SEC("xdp.frags")
int xdp_find_sizes(struct xdp_md *ctx)
{
xdpf_sz = sizeof(struct xdp_frame);
sinfo_sz = __PAGE_SIZE - XDP_PACKET_HEADROOM -
(ctx->data_end - ctx->data);
return XDP_PASS;
}
SEC("xdp.frags")
int xdp_pull_data_prog(struct xdp_md *ctx)
{
__u8 *data_end = (void *)(long)ctx->data_end;
__u8 *data = (void *)(long)ctx->data;
__u8 *val_p;
int err;
if (data_len != data_end - data)
return XDP_DROP;
err = bpf_xdp_pull_data(ctx, pull_len);
if (err)
return XDP_DROP;
val_p = (void *)(long)ctx->data + 1024;
if (val_p + 1 > (void *)(long)ctx->data_end)
return XDP_DROP;
if (*val_p != 0xbb)
return XDP_DROP;
return XDP_PASS;
}
char _license[] SEC("license") = "GPL";
|
